Grinding-mill



(No Model.)

H. S. ATKINS. GRINDING MILL.

No. 520,027, Patented May 22, 1894.

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UNITED STATES PATENT OFFICE.

I-IIRAM S. ATKINS, OF STOWE, VERMONT.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 520,027, dated May 22,1894.

Application filed December 22,1893. Serial No. 494,494. (No model.)

the county of Lamoille and State of Vermont,

have invented certain new and useful Improvements in Grinding-Mills; andI do here by declare that the following is a full, clear, andexactdescription of the same, reference being had to the annexeddrawings, making a part of this specification, and to the letters ofreference marked thereon. i

The present invention has forits object to provide a mill for grindingcorn and other grain that will possess the requisite wear and durabilityand perfectly operate upon the grain to reduce it to the requiredfineness in a comparatively short space of time, also in providing avery simple and effective device for regulating the mill to govern thedegree of fineness .to which the grain is to be ground. These severalobjects I attain by the construction substantially as shown in thedrawlugs and hereinafter described andclaimed. F gure 1 of the drawingsrepresents an elevatlon of my improved mill partly in section;

Fig. 2 detail viewsin perspective of the means employed for adjustingthe height of the grinding cone in regulating the mill; Fig. 3 a detailviewin perspective showing the means employed for attaching thebreaking-knives to the cone. Fig. 4 is a detail sectional view showing amodification of the step and block, the same being made in one piece.

a In the accompanying drawings A represents a suitable frame of anypreferred construction to which is connected bybolts and screws or otherwell known means a suitable shell 13, which shell is flaring andprovided upon its inner side with teeth (3. These teeth have screwshanks b which extend through holes in the shell and securelyheldthereto by nuts 0 engaging with the screw threads upon the shanks. Thismanner of connecting the teeth to the shell enables the teeth to bereadily removed should they become worn, broken, or

otherwise injured and new teeth substituted with comparatively littletrouble.

The shell B has a horizontally extending rim or flange d at its lowerend and at its upper end a similar flange or rim e by which the shell isconveniently connected to the frame A by screws and bolts hereinbeforedescribed.

To the lower end of the shellB is connected a supplemental shell D whichhas upon its interior, breaking -knives E to correspon with thebreaking-knives F upon the exterior of the grinding-cone G. Thesupplemental shell D may be connected to the shell B in any suitable andwell known manner although it is shown as fastened to the rim or flanged by screws.

The grinding-cone G is preferably made in sections and upon and aroundthe upper end thereof are secured bands H which are provided with teethI. The bands and also the teeth are removable, said teeth having screwthreaded shanks for convenience of removably connecting them to thebands, the teeth being substantially like the teeth upon the interior ofthe shell B. a

In order that the breaking knives upon the supplemental shell and thegrinding-cone may be readily removed when they become worn or broken andnew ones substituted, the knives at their base are of dove-tail form, as

shown at f Fig. 3, and fit in correspondingly The be in like mannerremoved when necessity requires.

The cone G is suitably connected to an upright shaft h which shaft atits upper end is provided with a pulley K to receive a belt, or anyother preferred means may be employed for operating the shaft. One ormore of the bands H may be connected directly to the shaft h and mayalso have teeth I, said shaft extending up through a boxing tin the"spider L as shown, which spider is suitably connected to the frame A. Atrough M is connected to the frame A to receive the ground material asit passes down from between the supplemental shell and cone and passesout through the spout 70. If desired some of the teeth I may have screwshanks adapted to engage with screw threaded holes in the cone, thereby,in addition to the bands H the teeth may be connected directly to thecone.

To provide means for raising and lowering the grinding cone F to controlthe fineness to which the material is to be ground,

l l l a horizontally and longitudinally movable wedge N is employedwhich is operated by a feeding-nut O engaging with the screwthreads uponthe shank Z. This nut is formed wlth a bevel gear wheel P with whichengages a pinion R upon the lower end of a shaft m, which shaft has itsbearings in suitable brackets n 0 secured to the frame A, and upon theupper end of the shaft is a handwheel p for operating it. As the shaftis turned by the hand-wheel the pinion on the shaft will turn thegear-wheel and with it the feeding-nut, and the nut engaging with thethreads on the screw-shank, will move the wedge forward or backward asthe case may be.

The shaft h at its lower end is supported by the grooved step S, saidstep being located wlthin a central opening or hole r in acentering-block T. The block and also the step have guide-grooves strespectively, and when together these grooves register with each otherso as to form a guide-way for the wedge N whereby said wedge is guidedin its longitudinal movement. This movement of the wedge will raise orlower the step and with it the shaft and grinding cone attached thereto,thus regulating the space between the cone and shell so as to grind anydegree of fineness. The block T is for the purpose of centering theshaft h by changing the position of the block through the medium of theset-screws M, which screws hold the block in its adjusted positionwithin a stationary ring U firmly secured to the frame A. If preferredthe step and block may be made in one piece as shown in Fig.4, assometimes this construction may 'be considered the most preferable.

There are many details of construction that are susceptible of changeor. modification which may be made without departing from the principleof the invention, and therefore I do not wish to be understood asconfining myself to exact details of construction herein described andshown.

Having nowfully described my invention, what I claim as new, and desireto secure by Letters Patent, is

1. The combination with a grinding-mill, of means for raising andlowering the shaft to which the'grinding-cone is connected, consistingof a movable wedge, a grooved step for the end of the shaft to rest on,and a grooved centering block, substantially as and for the purposedescribed.

2. A grinding mill having its cone and shell provided with independentlyremovable breaking-knives, means for raising and lowering thegrinding-cone consisting of a movable wedge, a grooved step for the endof the cone-shaft to rest on, and a grooved centerin g-block, and meansfor operating the wedge consisting of a feed-nut having a gear-wheel,and a shaft and pinion for operating them, substantially as and for thepurpose set forth.

In testimony that I claim the above I have hereunto subscribed my nameinthe presence of two witnesses.

HIRAM S. ATKINS.

Witnesses:

A. R. STRAW, HENERY LOTH.

